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There are very few options for 15" rims that fit over Subaru WRX 4 pots. Most are very expensive rally wheels that cost $300 each or more. This is the way I've gone to get 15" rims over my 4 pots, so i have more options for off-road tyres compared to 16".

1996 -2003 Audi A3, 5x100, R15"x6", ET38 rims with 57.1mm centre bore fit on a Subaru with 4 pot brakes. They're basically WRX rim offset, so sit out wider than the factory Subaru steelies but still sit within the guards.

Image stolen from dirtyimpreza forums and linked at bottom of this post.

Test fitted them on my car and they have heaps of room over the 4 pots.

They're light (5.8kg) and forged alloy - so they will bend and not shatter like most after market alloys.

2 small problems with them- they use a ball seat lug nut (Subaru are cone type), and the Audi center bore is 57.1mm compared to Subaru's 56.1mm. However both problems are easily solved.

Instead of getting special wheel nuts or washers (which I'm worried bout being lost) could you machine the wheels to take a tapered lug nut? I dont think too much metal would have to be removed...or is this "dodgy"?